6. Angela Merkel
German Chancellor Angela Merkel reacts during a statement after German Defense Minister Zu Guttenberg resigns earlier the day at the Chancellery on March 1, 2011 in Berlin, Germany. Most powerful woman on the planet. Chancellor of Germany oversees Europe's largest economy. Renowned free-market champion and favorite of big business, boasts nine public companies with annual sales in excess of $ 70 billion.(Photo by Andreas Rentz/Getty Images)